I'm replacing my stock horn with a Stebel Magnum. It's about twice the size of the stock horn. Mounted in the same location, the horn rubs on the brake line. Not good! I found another spot on the left side underneath the cruise control unit. But, I'm having a hard time trying to figure how to mount it. I believe I can use the existing horn relay and just plug it in and play? Any suggestions how to convert the Stebel to hook up to the BMW plug? I'm open to any comments or suggestions pro or con to my adventure!